linux-kernel - Re: [char-misc-next 3/3] mei: me: use an index instead of a pointer for private data

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Message-ID: <20170613134607.GA5042@kroah.com>
Date:   Tue, 13 Jun 2017 15:46:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [char-misc-next 3/3] mei: me: use an index instead of a pointer
 for private data

On Mon, Jun 12, 2017 at 12:15:57PM +0300, Tomas Winkler wrote:
> +static const struct mei_cfg *const mei_cfg_list[] = {
> +	NULL,
> +	&mei_me_legacy_cfg,
> +	&mei_me_ich_cfg,
> +	&mei_me_pch_cfg,
> +	&mei_me_pch_cpt_pbg_cfg,
> +	&mei_me_pch8_cfg,
> +	&mei_me_pch8_sps_cfg,
> +};

Does this structure have to keep in sync with:

> +enum mei_cfg_idx {
> +	MEI_ME_UNDEF_CFG,
> +	MEI_ME_LEGACY_CFG,
> +	MEI_ME_ICH_CFG,
> +	MEI_ME_PCH_CFG,
> +	MEI_ME_PCH_CPT_PBG_CFG,
> +	MEI_ME_PCH8_CFG,
> +	MEI_ME_PCH8_SPS_CFG,
> +	MEI_ME_NUM_CFG,
> +};

That value?

If so, why not make it automatic and have the array use the enum values?
That way you know you get it right.

At the very least, document the heck out of this...

thanks,

greg k-h